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Author Question: Rich galactic clusters ____. a. are rare, because galaxies are usually isolated in space b. ... (Read 79 times)

vicotolentino

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on: Jul 27, 2018
Rich galactic clusters ____.
 
  a. are rare, because galaxies are usually isolated in space
  b. contain gas that is rich in metals
 c. are composed of mostly elliptical galaxies
 d. are very spread out, without a defined center
 e. contain a wide variety of galaxy types and sizes

Question 2

What must be used to maintain the optics and operation of an infrared telescope?
 
  a. filters
 b. lasers
 c. coolant
 d. oxygen
 e. tertiary mirrors


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raenoj

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Reply #1 on: Jul 27, 2018
Answer to Question 1

c

Answer to Question 2

c


vicotolentino

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Reply #2 on: Jul 27, 2018
Thanks


raenoj

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Reply #3 on: Jul 27, 2018
Welcome :)


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